switch to a Document trait and introduce Script/Head/Style/Meta components (#2635)

* switch to a Document trait and introduce Script/Head/Style/Meta components

* Fix desktop title

* Insert special elements into the head during the inital SSR render

* Make all head component attributes optional

* hydrate head elements

* improve the server streaming head warning

* Document fullstack head hydration approach

* deduplicate head elements by href

* move Link into head::Link

* document head components

* add meta and title examples

* Fix a few doc examples

* fix formatting

* Add title to playwright tests

* serde is optional on web, but it is enabled by hydrate

* remove leftover console log

packages/html/build.rs

@@ -0,0 +1,9 @@
+fn main() {
+    // If any TS files change, re-run the build script
+    lazy_js_bundle::LazyTypeScriptBindings::new()
+        .with_watching("./src/ts")
+        .with_binding("./src/ts/eval.ts", "./src/js/eval.js")
+        .with_binding("./src/ts/native_eval.ts", "./src/js/native_eval.js")
+        .with_binding("./src/ts/head.ts", "./src/js/head.js")
+        .run();
+}